What is SMI and EFI labeling ?

I am trying to learn and configure zfs, and got to know that zfs uses the EFI labeling of the disk whereas the ufs uses the SMI labeling. Can someone let me know what is the difference between these two labeling so that I can grasp the concept. :-)
beer9Asked:
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joules17Connect With a Mentor Commented:
Sun systems support two types of disk labels: SMI and EFI. When should I use the SMI label; and when should I use the EFI label?
Solaris OS systems use two different types of disk labels: Sun Microsystems, Inc. (SMI) labels, and Extensible Firmware Interface (EFI) labels. SPARC-based and Solaris x86/x64-based systems only use SMI labels on their boot disks. Solaris OS systems do not currently boot from disks that use EFI labels. In general,disks used for purposes other than as boot disks may use either SMI or EFI labels. You change the disk label type by running the format -e command followed by the label subcommand.

https://learning.sun.com/solc/faq/1179270301
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beer9Author Commented:
Thanks :-)
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